of a
regulator. It's cleaner and usually temperature compensated.
Bob
From: ct1dmkct1...@gmail.com
To: Discussion of precise time and frequency
measurementtime-nuts@febo.com Sent: Tuesday, January 6, 2015
6:40 PM
Subject: [time-nuts] VC-OCXO EFC stability.
Hi
, January 6, 2015 7:35 PM
Subject: Re: [time-nuts] VC-OCXO EFC stability.
Hi Bob, That is the issue, it doesn't.
(the 2,3 different types I would like to use none of them have it, so I will
be making a small pcb with the trimpot and the regulator and some
capacitors etc).
Luis Cupido.
ct1dmk
I tried something like that once just to discover that the OCXO VFC port
had low impedance, so my voltage divider didn´t behave very well. So i
put an amp op in unitary gain configuration between the two and things
improved a lot. Then I changed the amp op for a DP precision part and
things
:40 PM
Subject: [time-nuts] VC-OCXO EFC stability.
Hi,
With a multiturn pot and a 78L05 I can get a 0 to 5V EFC to tune
an OCXO on desired freq. But... maybe other voltage regulators
or other scheme have better temp stability than the old 78L05.
Before I crawl lost in new'ish
Hi
If you find that your EFC port is low impedance - check it for a bias voltage.
It may well have a pull up resistor to an internal Vref. The intent is that you
simply tune it with a resistance to ground.
Bob
On Jan 6, 2015, at 8:49 PM, Daniel Mendes dmend...@gmail.com wrote:
I tried
Luis wrote:
With a multiturn pot and a 78L05 I can get a 0 to 5V EFC to tune
an OCXO on desired freq. But... maybe other voltage regulators
or other scheme have better temp stability than the old 78L05.
Before I crawl lost in new'ish fancy regulator land does anybody
know the killer
Hi,
With a multiturn pot and a 78L05 I can get a 0 to 5V EFC to tune
an OCXO on desired freq. But... maybe other voltage regulators
or other scheme have better temp stability than the old 78L05.
Before I crawl lost in new'ish fancy regulator land does anybody
know the killer solution/IC for
output? If so, use that instead of a
regulator. It's cleaner and usually temperature compensated.
Bob
From: ct1dmkct1...@gmail.com
To: Discussion of precise time and frequency measurementtime-nuts@febo.com
Sent: Tuesday, January 6, 2015 6:40 PM
Subject: [time-nuts] VC-OCXO EFC
Subject: [time-nuts] VC-OCXO EFC stability.
Hi,
With a multiturn pot and a 78L05 I can get a 0 to 5V EFC to tune
an OCXO on desired freq. But... maybe other voltage regulators
or other scheme have better temp stability than the old 78L05.
Before I crawl lost in new'ish fancy regulator land does
